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L02_GravTheoryMeasurement-page5 - cementation porosity pore...

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Applied Geophysics – Gravity theory and measurement Rock density Mass = Density x Volume Lateral variations in rock density result in gravity anomalies that can be measured at the surface Applied Geophysics – Gravity theory and measurement Factors influencing rock density Unconsolidated sediments – composition, porosity, saturation Sedimentary rocks – composition, age and depth of burial (compaction),
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Unformatted text preview: cementation, porosity, pore fluid Igneous rocks – composition (esp. silica content), crystal size, fracturing (i.e. porosity) Metamorphic rocks – composition (esp. silica content), metamorphic grade, fracturing (i.e. porosity) Porosity and pore fluid content are probably the most important factors affecting density in the shallow sub-surface...
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